The element from group 15 that forms a strong bond with hydrogen is:

Which of the following correctly explains why NH₃ is highly soluble in water, whereas PH₃ is only sparingly soluble?

Which of the following types of π-bonding is present in the N₂ molecule?
1. \(p\pi-p\pi\)
2. \(p\pi-d\pi\)
3. \(d\pi-d\pi\)
4. Only sigma bond

Which of the following Group 15 elements does not have a d-orbital in its valence shell?

Which of the following correctly explains why NH₃ forms hydrogen bonds whereas PH₃ does not?

A balanced chemical equation for the reaction showing catalytic oxidation of NH₃ by atmospheric oxygen is:

Which of the following is the correct electronic configuration of the element belonging to Group 15 and Period 3 of the periodic table?
1. \(\mathrm{1 s^2 2 s^2 2 p^4} \)
2. \(\mathrm{1 s^2 2 s^2 2 p^3} \)
3. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^2} \)
4. \(\mathrm{1 s^2 2 s^2 2 p^6 3 s^2 3 p^3}\)

Nitrogen gas is liberated by the thermal decomposition of:

1. ${\mathrm{NH}}_4{\mathrm{NO}}_2$                                 

2. ${\mathrm{NaN}}_3$

3. ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                           

4. All of the above. 

The correct structure of pyrophosphoric acid is:

1.		2.
3.		4.

Which of the following correctly represents the gaseous products formed on heating ammonium dichromate and barium azide, respectively?